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Share-based Compensation (Fair Value of Nonvested Shares and Performance Shares) (Details)	12 Months Ended
	Jun. 30, 2017 $ / shares
Stock Compensation Plan [Member] | Nonvested Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value (in dollars per share)	$ 30.85

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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X

- Details

Name:	us-gaap_PlanNameAxis=stx_NonvestedSharesMember
Namespace Prefix:
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Period Type: